Blew out candles and smell was strong. 26 weeks pregnant. Harmful to baby?

No! With your short exposure, the answer is an absolute: no! it is good that you are aware of second hand smoke exposures. Pahs (polycyclic aromatic hydrocarbons)can be very dangerous to your health, increasing risk of asthma and cancer if prolonged exposure exisits from indoor pollutants like home heating fuels, tobacco smoke, cooking blackened foods, and burning candles and incense.